Water-tube boiler.



No. 856,185. PATENTED JUNE 4, 1907. G. SINCLAIR, DEGD.

11., A., G.. J. 0. & w. SINCLAIR, TRUSTEES AND nxnouwons. WATER TUBEBOILER.

APPLIOATION FILED 0011.23, 1906..

3 SHEETS-SHEET 2.-

g 1 .wnwsssss jam? for My 04. 251W W DEQ W ATTORNEYS UNITED STATES E TOFFICE.

ROBERT SINCLAIR, OF EDINBURGH, ALEXANDER SINCLAIR AND GEORGE SINCLAIR,OF LE-ITH, AND JAMES C. SINCLAIR AND WILLIAM SINCLAIR, Oh EDINBURGH,SCOTLAND, TRUSTEES AND EXECUTORS 0F GEORGE SINCLAIR, DECEASED.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented June 4. 1907.

Application filed October 23,1906. Serial No. 340,131.

DER SINCLA/IR and GEORGE SINCLAIR, boilermakers, both residents ofLeith, 1n the county of Mid Lothian, Scotland, and JAMES CHALMEnsSINCLAIR, engineer, and VVILLIAM SINCLAIR, chemist, both residents ofEdinburgh, aforesaid, all of whom are subjects of the King of GreatBritain and Ireland, and are trustees and executors of the late GEORGESINCLAIR, boiler-maker, Leith, aforesaid, who did inverlt certain newand useful Improvements in ater-Tube Boilers, and of which the followingis a specification.

. The invention has for its object to improve the construction ofwater-tube boilers of the type having upper and lower cylindrical drumsconnected together by rows of straight water tubes, so that ,while thetubes can be readily assembled, or removed for renewal or repair withoutrequiring headroom in the boiler house above or beyond the upper drums,the known advantages of cylindrical water drums are obtained such asthat there bein no portion of the drum in the form .of a is lessliability to buckling and consequent damage to the tube fixings and thedrums do not require to be internally stayed to give them the necessarystrength.

In this type of water-tube boiler, as nither-.

to generally constructed, manhole doors or other form of openings in thedrums have had to be provided to permit of the tubes being assembled andwithdrawn, even though the opposing surfaces have been formed withseparate landings for the ends of each tube, as with. such knownconstructionthe landings are so spaced that when tnbes reqilire to'bcreplaced they must be withdrawn and inserted through the doors, andwhere headroom is a desideratum this is a. disadvantage as it is evidentthat the height of the boiler house above the upper drums must be atleast the-length of the tubes; or, to the same endfa portion of theopposed surfaces of the upper and lower drums have been corrugated andstepped, each step receiving the ends of one pair of a double row oftubes, there being no tubes iIat tube plate therein thespace oppositethe corrugation formed in the part of the surface of the cylinderbetween each double row of tubes so that the tubes can be inserted orwithdrawn through this intervening space from the side of the tubeboilers, to permit of straight fire tubes being used, separate landingsfor the ends of each tube have been formed in one of the tube plates. Y

In carrying out the invention. any convenient arrangement of upper andlower chambers or drums may be used, such as one, two, or more pairs ofsuch upper and lower drums with the furnace or furnaces arranged eitherat the end or side of the drums; or one upper drum and two lowerd'ri'lms may be employed with the furnaces arranged in the space betweenthe lower drums. The drums are connected together by rows of straightwater tubes and they are of a size which permits of the ends of thetubes being expanded when in position from the interior of the drum. Theopposing surfaces of the upper and lower drums have formed in them rowsof separate circular landings for each water tube. The landings areparallel with each other and at right angles to the axis of the tubes. Aspace at least equal to the diameter of-the tubes is left between eachtransverse row. By providing a separate landing for each. tube andleaving a space between each transverse row it is possible to dispensewith the necessity offorming'corrugations in the drum to permit of theinsertion or withdrawal from the side of the boiler of the tubes inadjacent rows.

In order-that the invention and the manunderstood, there are hereunto apended three sheets of explanatory drawings, t ough out which likereference letters indicate like parts, and in which Figures 1 and 2,Sheets 1 and 2, are longitudinal vertical sections showing the.improveboilers; Fig. 3, Sheet 3, being a transverse vertical section ofanother example. I e

As shown in Fig. 1 of the draWin s one pair of upper and lower drums, A,y are used, the furnace, C, being arranged at one ner of performing thesame may be-properly boiler, also in certain known forms of firements asapplied to two forms of water-tube- IOO r Bafiile plates, D, areemployed, as usual, to

cause the products of com ustion leaving the furnace, (J, to take anydesired course in their passage to an exit flue, E.

.The opposing surfaces of-the upper and r lowerdrums, A, B, in each ofthe examples hereinbefore described, have formed in themrows of separatecircular landings, G. Open ings are formed in each or these landings toreceive t e end of one connecting water tube,"

H, these andings being at right angles tothe':

axis of the tubes and bein ormed by pressi-ng outward or inward .t esurface of the drum, 'or by pressing it partlinward and partly outward,2 5

ticallynot requiring any landin Aspaceat least equal to the diameter oft e tubes, H, 0 is left betweeneachtran's'verse row so', as to 1 permitof the easy insertion or withdrawal of a tube in any row when necessarywithout disturbing the other tubes. By providing a; separate landing foreach tube andleaving a 3 5 space between each transverse rowit is pos-'I -The depth'o the landings, is g'reater'for the outer tubes of eachrow, decreasing as, the landings approach the'center,fthe twoc'entraltubes in each row prac'- 1 sible to dispense with the necessity offorming corrugations in the drum .to permlt of'the insertion orwithdrawal. from the'side of the boiler of the tubes in adjacent rowsWhat we claim-is:

1. In a'water itube boiler, a plain drum having separate tube landingsformed'there-':

in, "in parallel rows, and so arranged as to leave suflicient spacebetween'the ad acent transverse rows for the lnsertlon or withdrawal ofthe tubes'from either side of a row withoutthe use of manholes, asdescribed.

2. In a water tube boiler, a plain. drum} having parallel rowsof se.arate circular-tube landin s ,formedpartial y above and par-' tiallyelow the'drum face, and so arranged 'asto leave sufficient space betweenthe adacent transverse rows for the insertlon o withdrawal of-the tubesfrom either side of,

row Withoutthe use of manholes, as;

scribedh v p. g a v In testimony whereof we have slgned' our names tothis specification, in the presenceof the two subscribing witnesses,

ROBERT- SINCLAIR, ALEXRSINOLAIR, GEORGE SINCLAIR, JAMES QfSINCLAIR,WILLIAM SINCLAIR,

Imatees and enpe'cu-tors of George'S'iacZair, de-.

' ceased.

Witnesses:

WILLIAM ARMSTRONG, ROB RT ALEXANDER LAMBERT.

